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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6264f7a56542c3e4eb8d3556f9a620d48023095667f47e66ebbcf45350745206' 
  AND token = 'x0/NOn9G/E/EbnAa+gN3H8AS94Kx5Re2vowCO2Rbic4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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