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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942b0b332ea0728a4181da40b91f7d4a71b7a54b81f049856446d8a617b3d20e' 
  AND token = 'zOI+eD0+t0OOUjsqVAvVx0r6egKmzAocl/JokF7+eUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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