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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f5da446e6a97f6d1695d06ed110ced489526060231d8ca198acc94ba8324a2' 
  AND token = 'FCes6NnfiKNfvIVENCWQtvuB8fS29i17ffVMxj2J9As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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