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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fce1897c550bea42e4cb009f8fe5d14777ca15c4245f6eb71f67b6c14f26db' 
  AND token = '2Ca/PcsoYKWtHL65TNvciXau4oQlPc2EFHwflgxGddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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