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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938482c687c21f666f5017316858c8564ec1039200ce00501ce29611d46d682a' 
  AND token = 'RBTUWWrIQOPYxSbWMklxyDmaF6mG53n7gKsEQMVVT8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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