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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806a86e6e5f956c0b5870b25bae8c8fa87fc3126c63f955477e6a2e2424732b5' 
  AND token = 'Bz7bkJRmDTWipu2NBYFdyHL2uxfw/l6HqyhBHHReee0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}