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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920d72da1c6df4a1d57d45e5117fd52230335385dc115ce153e925baa1009998' 
  AND token = 'sWHsBArjsPKWoyNN+yrE4c68NS1lqwAj9tq2mcGub4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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