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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc819b27d9a6646e1939d43225022988c6b80f6648bd88a49b15becd295993d' 
  AND token = 'bnSDRNppwHQEofa7IyRa2QFqGCAMGEGZZlys5m+G0Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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