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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c105d803e71ce111e92deaad528af9cf840418fd6f0e0e737e0ae7e8c56c1e7' 
  AND token = '2yXMkf+Q69Lx3rdwJRgLQC39muXbwuc4scnVTFyxjBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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