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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b69f19bb41b00b14a35549f60a2375c8750f142438222a6c1df6675e927bda9' 
  AND token = '3JrflfhsLV5akXOvvv6DbfqLoJQVXcBT6TTp8U/10+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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