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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4c1ef219a5b9e2bc933964d9a3d26665865a6ff255c7c65677bba540f2703b' 
  AND token = 'JnTbsRADFRv3snAVeAKiEQ8Y9UwH130rZBNuVkVVoa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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