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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74510b7a1bee245e879bb649ab6b41cbbe6985c3ad28afd867c030b8b39609d3' 
  AND token = 'Lfy6Np9fh0x81BpaG3HXDs+gW3CdaUpm2DMicJBBNx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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