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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9bf0e4b9d63596458fd5529c46d5f2e3cd5a71d6c37d5a6e294f0f9f5df8d5' 
  AND token = 'A/xs4J3zeq4PLqA9tCQhKEANLOIRJ+zMmKJLdHNB158=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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