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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5e2d8b2e2b9af781f4c9ed8e1da0c4998517fbe4405d641d3a90bdb37e38d3' 
  AND token = '3xC1DdhQtmFvde48JtmKBo4IRLLUj3uv2ZpMcNaROTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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