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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '315f5f071dbbf6eefad64222fbb2e5d328f82f538e354708d5e9385daa3bf1ad' 
  AND token = 'X9FuU4FPeq2jNbSR6WTgnNkPHIyADfCderqlptrC7qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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