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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27eb0d3abf4d4746915512cd4e51b81ea2d37ea16bfd8d0e2e6a37d9f8dd9772' 
  AND token = 'dmzeXat8W52TOsytHp1b5XyJN1eGV/hQ2vkOtwnpLyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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