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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4288d28008b07bb9036d0e1e58ceee85d884bbdff254cf7339841ca8216ce78' 
  AND token = 'e96P4IqNs1ru4ZVQgoFYGIdmog8ZxYljYfJaPq75Woc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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