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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d138ff80e57110675a0fdc6c631963be4dde58d7afb6c8d9fdbfe0e6d502b2e' 
  AND token = '1pfhJpWcNx6fsMP/ZsN5bwJqr11XwDtLJD+jRTU1oUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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