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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14b6dc9043b7bedcff10c18cc43f888ee1e7fb436cedd382da8795ab1225bc5' 
  AND token = 'Kx+bzNTok0Vk6ySrW64iON1dhz2kwfcah+r8+bybvXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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