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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55c2cd5e24c3a44e6d68ce4425e30fd0530040b4d388c3353f5ff5b659b4c7a' 
  AND token = '5KbvVr9bhwKSb1y5csEfsKNY6ns3RIQqbLCufmb7Wnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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