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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99612a0fe48fd313876f2e8edc7d14c1a9a777d92660a97d1df86be2546ea00' 
  AND token = '7RuNjPXoX9SLMizacVoigwyz18Idzg1aWU4kGCdBUfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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