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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b129194d99c604ee34306d8cf1a6620b91383a9feae3223ee2cb66e50394797' 
  AND token = 'oBMpDFtng09nM7fS0zQtIIlo7NCb7Ozdz4hO3Ns34Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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