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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619720103f371df58e0fe19d3d9bd836610f4b975ca3ea2a866216882923ffef' 
  AND token = 'z+mctvr1xFf83q8O77m+HgkzARKAAGYqJbfPuu9MJTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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