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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26980b18f4528e7f60e02caf5fcc1ade52e8e00d0e01e1c70e2daf792586e466' 
  AND token = 'RSpBdOPJ72VDPgARfhp62LBJ7n1E30EcaszKNCYw75Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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