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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9e5162c78074a05fff7505c21ea13be326e09e32a623a7f79660359e1e2a36' 
  AND token = 'ssUIlYVwK6db61KDTBHNCf08AnC9LkrX0ldg3s4zT8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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