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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f906c72f54bdc08dde37b0baa070ebb06b8da8beb895235381c269118a7788a' 
  AND token = 'EhLII1qh3iDIywpu9hP1FmmYjhiWjC0rwRJcQN9LE0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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