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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231417e8898b6cdbc2eb9b782741d3141ba5ed915ccfeec903f1f6848f9ab06c' 
  AND token = 'Ixlb9pHjYkuI8QFbmAlPBls4AtfibJkRLkN3Bxp4y2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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