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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9356e8c1a79f137d8739b20fdc1833397226a27d65bfab580d4c2ab3b77cb7f9' 
  AND token = 'J8Rps3Qj4ICWVbzFQUJq6r7M09qLCwzppynRLIP3N9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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