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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02250f4f8f8cc2751e67639f3bd24ce363b25a76bb62a2e98d4dfaaac877cacb' 
  AND token = 'cnCQxyqETnJ/SirXFJWP4ttQ/kJPnn8mFDaTlM4R0PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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