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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa480afcfb52594488b16c7bac38e2db47d06eb9954fb51bdc3aab5967c19005' 
  AND token = 'ttQDeAi4gIP6zYg68cQZX6yc0IvW/J3ATyrj1g2Cgqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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