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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a75e790102bc6ab08d32a9f887a4d0cf7b4e2481747c0f32d5d416d390f621b' 
  AND token = 'LrubrmoA9vXQlQwPUl36xt9ZMPuBio3OGAOlbvo3/9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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