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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78933fb6fe0a8eb56bae1a166663e93f16dd836738972ea8381e16ca9d1bcf6' 
  AND token = '355BrYwYGOBUVkCRmypTquqh8GN3Fu7R2x9VLeXD8JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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