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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46debd7d3bc68ff1c903773d4d8aee17c195badf565050dd76d6974cd4c7d88' 
  AND token = 'IhYw4llAEhwQFSM49fzxwbFIgC/9hgQc7db0ZffGAqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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