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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d7b3d6f60e9aee4e253836ee169645d09ad02ac7018ae3f06c49a714ef63cd' 
  AND token = 'sn1agizGTDlbc7rIzLhj282YBpERU807dHlSYN/fnmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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