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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b867758cb3e28b284b993d605e833e487120e71f8488a73fbf168238061ea5a9' 
  AND token = 'Q1K9dQJ0NitSlxV8UnAR+yjn4T+Acpq7OIbJX/ejoH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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