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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae211b2975e05ba88d144c295095fc87e1064099393e90a0d12dae830e69d174' 
  AND token = 'rlU2EXvbFd981lh0mCWZ0W9m5weQ294ftMl+k+x8Z1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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