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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c05753fe9433fa06d64f7d7bac86abf13eba58bf5a4761604c3dbebf69a7ce' 
  AND token = 'EBDALMCMcqELEQ0P49s9hQDuBHH3o8x5tJE9mg4IokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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