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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8456f2552ba62d988ff36e17e74a3978cb84f686abb194bd5843cd5729e1bda4' 
  AND token = 'h2zEYQFOH5BEOsxqse5yq3eulPksDv3LKDsrlIMT6QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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