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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e190b02e68f3b90e9ecb8a587524d138e162eecf6d6ffd7eb8fce7640e3693cb' 
  AND token = '1Z7UdosIoXEQwXNBgrbGI0UdtgKcn3Mx1YheF1TRZ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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