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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2deb2e8c9f59dab51bae9ba756c6905fa8d8f6ed51ab4e96a150aee15e91753a' 
  AND token = 'eNm4RZlwaO1sXqdM2BJL3S8Z6gZZdA8vkdfKG2O5ixU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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