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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a6832e1649061f9b9f5d54d0b9b380945c1c7203d299ae9e85099930105648' 
  AND token = 'mmbnu2fu8Nucm0ui+oHGEyQkx70e8+hbWVjM3YGGv+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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