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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43125af705cfab7f37f6fe50fbcff3c44936188f4d5ec3e10889ac2d75f909b' 
  AND token = 'TrvJPGQOHCp3bDHpCrVQ63L5gLi9ELkSUqc/B3uTbt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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