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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029026e22abe4da62bd8f1e30ec9d31bf4ecdd52d21434d6d8a86b586bcbd19b' 
  AND token = 'Pc/K71kE8eIusqX2HGU65dI4hdMLS1QAlfbDDONRRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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