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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17c0ac58ad2067e7f1b4dafd179232a74d45d65db22cc8aaac1a31d56bbc5a2' 
  AND token = 'tLQ0NMpiiG8fRKFytWJyq/+Ptgc4mlmYiv5uqaz3VYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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