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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70b70fc0e5a9cc8989ae1fe664a86b285d559ee757494a2247ab1654cbba9bc' 
  AND token = 'tE3Ruje/Dbq08ZMIPA+ojZeikOSYfhqX+gIncoIkaIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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