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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980a47c01d617e521d5d06ff4e2e76a413c8e065ecb05c1d969b7023cbc836e8' 
  AND token = '7M6DJAtywpWP5idAt85iI01bW34L93B2TFZC7m0Z7Gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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