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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae608f1aa89357f285ac6ba06cb82ca8b7c0845f9158d0c2d3641cee50134921' 
  AND token = 'L05Sov7icpAC/b8UxAPA0m1jSPPd3IVEnetpGWZSsc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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