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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ead285645bc4da884b0cae985c54329614eab9ffb8646edd14b97de2385e1b' 
  AND token = '7L9/pK7ux5tC0PcXxAPKXptQOaVANtWCf15I1cArfy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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