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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b493f580ea2b83bf9f9df542d80fc3c3d959a09e2ed84f3ed697d4194b0e7f' 
  AND token = 'y6Bku05YVfiyMeFzJnxkQ7cA1HNz55E1GmhsNsCFv0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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