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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85dcffa726f4d72e8e2e5999e3dc7b8787ef9997dec7adae2dfea3a897add0f7' 
  AND token = 'PC00r78XY8Rjg7UYZt1V+ZCq6/gJM7uMfJaEQ5TB7IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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