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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66512434e0b8f2b830fe54100a792726850849a1d1b244ad3be7f7e83c06d3fa' 
  AND token = 'oLKQ/RYvYse3PUE1Q8/faMe6R/hJwHN/A6TVeIa86ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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