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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b5dff102d74a4d6f0fbd71a398e69d3f8a5bd6a67c9638052e078f3d63aa42' 
  AND token = '9oAmZ10o9xWaAZWkwu1kf82ATQz/8oBe6oy1uwgKrnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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